Flexible hose

ABSTRACT

A flexible hose having an air-permeability and formed either: by sandwiching an air-permeable tape between the tape end edge portions, as leading and trailing in the hose longitudinal direction, of a soft resin tape to be helically wound, and by winding the air-permeable tape integrally with the soft resin tape; or by winding only the air-permeable tape helically. Especially, the air-permeable flexible hose can be properly used as a cleaner hose of the discharge circulation type by using it as an outer tube of a double tube. By giving lubricating properties to the inner circumference of the outer tube or the outer circumference of the inner tube, on the other hand, it is possible to prevent the wear which might otherwise be caused by the rubbing contact.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a flexible hose which has proper flexibility and strength despite of an air-permeable structure and, more particularly, to a flexible hose which can be suitably used in a vacuum cleaner as a suction hose for connecting the suction nozzle and the cleaner body.

[0003] 2. Related Art

[0004] In the flexible hose to be used as a sucking/discharging or blowing duct, a portion of the air to pass through the hose may have to be discharged to the outside from midway of the hose or sucked from the outside. For example, an electric conductor is inserted into the hose, but its heat generation can be suppressed by introducing cooling air into the hose. At this time, the cooling efficiency can be better improved by introducing fresh air through the individual portions in the hose longitudinal direction from the outside.

[0005] Alternatively, the entrance of a hose is disposed to face the hot wind exit of a warming fan heater to introduce the hot wind into the hose and to blow out the hot wind from the midway air-permeable portion. Then, it is conceivable to utilize the hose for drying the wash or to utilize the hose as a steamer by disposing wet cloth in the air-permeable portion.

[0006] However, this flexible hose is provided with the an air port so that it is defective in the drop of its entire strength and in the shape keeping property.

[0007] In the business or home vacuum cleaner, on the other hand, generally, the cleaner body having a suction motor and a filter therein is connected with a suction nozzle having a suction port through a flexible cleaner hose so that the dust sucked from the suction port of the nozzle is fed from the cleaner hose to and collected in the cleaner body while the air having passed through the filter in the cleaner body being discharged from the exit port at the body back to the outside.

[0008] When the air is thus discharged from the body, however, there have been pointed out the disadvantages that the dust is blown up by the discharge pressure from the floor left unclean, and that the air has an uncomfortable discharge smell.

[0009] In order to solve these problems, there has been developed in recent years a cleaner hose having a double tube structure. In this structure, the air having passed through the filter is not discharged as it is to the outside but is circulated from one passage of the cleaner hose to the nozzle, and the having left the nozzle portion is sucked again as the sucking air from the suction port so that a kind of circulation circuit is constructed.

[0010] If the once sucked air is not wholly discharged but wholly discharged to the nozzle, however, the load on the suction motor is so seriously increased by the passage resistance up to the nozzle so that the calorific power is enlarged. If the capacity of the motor is enlarged to prevent it, the cleaner is defective in the entirely enlarged size and in the raised cost.

[0011] If the cleaner hose is doubly tubed, on the other hand, the clearance between the inner tube and the outer tube is not so large that they rub each other when the hose is bent. As this rubbing is repeated, the hose may be worn and thinned so much as to be broken. Especially in one of the inner tube and the outer tube, there are sheathed conductors for connecting the cleaner body and a switch or the like on the nozzle side, and the conductors may be exposed as the aforementioned wear proceeds.

SUMMARY OF THE INVENTION

[0012] Therefore, a first object of the invention is to provide a flexible hose which has a sufficient strength while retaining an air-permeability.

[0013] Another object of the invention is to provide a flexible hose which is formed by winding both a resin tape and an air-permeable tape helically so that a desired length from short to very long ones can be arbitrarily made.

[0014] Still another object of the invention is to provide an optimum hose in which a resin tape of a soft resin is reinforced by a reinforcing core or cores so that the hose is given more proper flexibility and strength and is optimized as one to be repeatedly bent.

[0015] A further object of the invention is to provide a flexible hose which is formed by winding an air-permeable tape reinforced by the reinforcing core or cores, helically so that it is given a strength in its entirety and a proper flexibility while retaining a sufficient air-permeability all over the hose.

[0016] A further object of the invention is to provide such a cleaner hose for releasing a portion of the hot air to be circulated to the nozzle, as has suitable flexibility and strength for the cleaner hose while retaining an air-permeability.

[0017] A further object of the invention is to provide a hose which is formed by winding a tape of a soft resin helically integrally with and through an air-permeable tape sandwiched between the end edge portions of the tape in the hose longitudinal direction so that the entire hose strength and the proper flexibility are given by the shape keeping property and the flexibility of the soft resin tape while retaining the air-permeability, and so that it is optimized for an outer tube of a cleaner hose having a double-tube structure.

[0018] A further object of the invention is to provide a flexible hose for a cleaner, which can release a portion of the hot air circulating toward the nozzle through the air-permeable portion of the outer tube, so that it can prevent from the motor of the cleaner body from being overheated, to improve the durability of the motor.

[0019] A further object of the invention is to provide a flexible hose to be used as a cleaner hose, which easily enabled to have an arbitrary draft by changing the ratio the widths of the air-permeable tape and the resin tape to be helically wound on each other.

[0020] A further object of the invention is to provide a flexible hose to be used as a cleaner hose, in which the air-permeable tape is made into a two-layered structure of a woven fabric and a nonwoven fabric so that the weaving members of the woven fabric especially in the hose longitudinal direction resists to the tension in the longitudinal direction when the hose is bent, while preventing the dust in the hose by the nonwoven fabric from being discharged together with the discharge having the heat, whereby a strong hose can be obtained.

[0021] A further object of the invention is to continue the air-permeable effect for a long time by winding the woven fabric on the outer side of the hose while preventing the air-permeable holes of the outer woven fabric by the filter effect of the nonwoven fabric from being clogged by the dust.

[0022] A further object of the invention is to provide a flexible hose for a cleaner, in which the air-permeable tape and the resin tape are fused with the reinforcing resin core or cores of the resin tape so that a highly strong fusion is obtained by the high heat capacity of the reinforcing core or cores to reduce a feat of separation at that fused portions.

[0023] A further object of the invention is to provide a double-tube structure having an inner tube and an outer tube, which can reduce the wear of a cleaner hose, as might otherwise be rubbed when frequently bent, by giving lubricating properties of a lubricant to at least one of the outer circumference of the inner tube and the inner circumference of the outer tube to possibly rub each other.

[0024] The objects and features of the invention other than the aforementioned ones will become more apparent from the following embodiments to be described with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0025]FIG. 1 is a sectional view of a flexible hose of this invention;

[0026]FIG. 2 is an enlarged sectional view of an essential portion of FIG. 1;

[0027]FIG. 3 is a perspective view showing a method of winding the flexible hose of the invention;

[0028]FIG. 4 is a sectional view showing one using example of the flexible hose of the invention;

[0029]FIG. 5 is a sectional view of an essential portion of another embodiment of the flexible hose of the invention;

[0030]FIG. 6 is a perspective view showing a method of winding a flexible hose which is made exclusively of an air-permeable tape;

[0031]FIG. 7 is a sectional view showing a using example of the same;

[0032]FIG. 8 is a sectional view of a flexible hose of the invention to be used as a cleaner hose;

[0033]FIG. 9 is an enlarged sectional view of an essential portion of FIG. 8;

[0034]FIG. 10 is a perspective view showing a method of winding the flexible hose of the invention;

[0035]FIG. 11 is a side elevation of the entirety of a vacuum cleaner using the cleaner hose of the invention;

[0036]FIG. 12 is a sectional view of an essential portion, as longitudinally taken from the cleaner hose portion of the invention of FIG. 11;

[0037]FIG. 13 is a sectional view of a cleaner hose and shows another embodiment of the invention;

[0038]FIG. 14 is an enlarged sectional view of an essential portion of the same;

[0039]FIG. 15 is an enlarged sectional view of an essential portion of an air-permeable tape; and

[0040]FIG. 16 is an enlarged top plan view of an essential portion of a woven fabric to be used in the air-permeable tape.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] In FIGS. 1, 2 and 3, reference numeral 1 designates a soft resin tape of the invention, as made of a non-vinyl chloride resin such as a polyolefin resin or polystyrene resin, or a vinyl chloride resin.

[0042] This resin tape 1 is semicircularly bulged at its two widthwise spaced portions to form two ridges 2 and 2 in the tape longitudinal direction on the outer side portion for the hose outer circumference and two grooves 3 and 3 also in the tape longitudinal direction in the inner side portion for the inner circumference.

[0043] In these grooves 3 and 3, individually, there are buried and fixed linear reinforcing cores 4 and 4 to give the tape 1 proper flexibility and strength. These reinforcing cores 4 and 4 are made of a hard resin such as polypropylene or a metal wire.

[0044] Numeral 5 designates an air-permeable tape of the invention. This air-permeable tape 5 is made of nonwoven or woven fabric, but may be made of another material if this material has an air-permeability and a proper flexibility.

[0045] Moreover, these resin tape 1 and the air-permeable tape 5 are helically wound to form a hose 6. At this time, a spacing is prepared between the tape edge portions, as leading and trailing in the hose longitudinal direction, of the resin tape 1 to be helically wound, and the air-permeable tape 5 is helically wound together with the resin tape 1 while filling the spacing. As a result, there is formed the flexible hose 6 which has the air-permeable portions partially in the hose longitudinal direction.

[0046] In this embodiment of FIGS. 1 and 2, as especially indicated in FIG. 2, one end edge of the air-permeable tape 5 is laid over the inner side of one end edge of the resin tape 1, and the other end edge, as confronting the former end edge, of the air-permeable tape 5 is laid over the inner side of the other end edge of the resin tape 1. The portions thus overlaid are integrated with each other either by adhering them with an adhesive layer 7 or by fusing them. At this time, the air-permeable tape 5 may be adhered or fused at its end edge portions to the outer sides of the resin tape 1.

[0047] The flexible hose 6 thus constructed has such an air-permeability as to suck/discharge much air or another gas or liquid through the air-permeable tape 5 at a flow velocity unlimitedly approximating to 0. In view of the hose entirety, the resin hose 1 having a high strength retains the entire shape keeping property so that it can retain the excellent shape keeping property and strength even where it is used in repeatedly bent applications.

[0048] This flexible hose 6 can be used as fermentation bath air feed hoses to be piped in a fermentation bath such as a dust disposer, a compost or a pickle bath. In this use, the flexible hose 6 can feed fresh air homogeneously to suppress the multiplication of anaerobic bacteria thereby to prevent the putrefaction and reduce the frequency of agitations.

[0049] When the flexible hose 6 is used as fish preserve oxygen feed hoses to be piped in a fish preserve, especially in a marine one, on the other hand, it can feed the air (or oxygen) easily over a wide range by means of pump thereby to prevent the massive death of bred fish, as might otherwise be caused due to shortage of dissolved oxygen by the red tide or the green seaweeds (as called “AOKO” in Japanese) especially in summer.

[0050]FIG. 4 shows one specific example for using the flexible hose 6. This flexible hose 6 is used as an outer tube of a double-tube structure so that a gas or liquid to flow in an inner tube 8 may be cooled by the air between the inner tube 8 and the outer tube or the flexible hose 6.

[0051] In the inner tube 8, for example, the gas or liquid flows leftward, as indicated by arrow A in FIG. 4. The gas or liquid in the inner tube 8 can be cooled by forcing the cooling air to flow rightward, as indicated by arrow B in FIG. 4, in the space between the flexible hose 6 of the invention and the inner tube 8. At this time, the cooling efficiency can be enhanced higher by introducing fresh air at a proper rate from the air-permeable tape 5 of the flexible hose 6. Another using method may be exemplified by returning the gas having been fed through the inner tube 8 at the end to circulate returned gas into the outer tube or the flexible hose 6 of the invention while allowing the partial or whole gas to leave the air-permeable tape 5.

[0052] In FIG. 4, the inner tube 8 is also made of the flexible hose by winding a soft resin tape 9 similar to the resin tape 1 helically and by adhering or fusing the confront end edge portions of the tapes leading and trailing in the longitudinal direction. On the other hand, the tape 9 forming the inner tube 8 is also semicircularly bulged at a plurality of widthwise portions to form grooves 10 in its inner circumference, and a reinforcing core 11 of a hard synthetic resin or a metal wire is buried in the grooves 10.

[0053]FIG. 5 shows another embodiment of the flexible hose 6 of the invention. The soft synthetic resin tape 1 to be helically wound is given a double structure including an outer tape 13 forming the hose outer circumference and an inner tape 14 forming the hose inner circumference. The end edge portions of the air-permeable tape 5 are inserted between the individual end edge portions of those outer tape 13 and inner tape 14, and the two outer and inner faces of the air-permeable tape 5 and the outer tape 13 or the inner tape 14 are adhered or fused to each other and are helically wound together.

[0054] In this embodiment, the outer tape 13 is semicircularly bulged at its one widthwise portion to form the ridge 2 on its outer face and the groove 3 in its inner face. In this groove 3, there is buried and fixed the reinforcing core 4 which is made of a hard resin. The outer tape 13 and the inner tape 14 are integrally adhered or fused to each other at their two side portions across the reinforcing core 4.

[0055] In addition, the air-permeable tape 5 itself may be made to have the double structure and sandwiched between the end edge portions of the resin tape 1. Moreover, the end edge portion of the resin tape 1 and the end edge portion of the air-permeable tape 5 are not overlaid but may be connected to each other through the reinforcing core 4.

[0056] Here, the means for forming the aforementioned air-permeable portions may be further conceived, as follows. When the resin tape 1 is to be helically wound, at the overlying portions between the tape end edge portions leading and trailing in the longitudinal direction of the hose 6, there is sandwiched and adhered or fused a tape which extends through the overlying portions and which has perforations in the widthwise direction for providing the communication between the inside and the outside of the hose. Between the overlying portions, alternatively, there is also sandwiched and adhered or fused a tape which has projections for forming a clearance in one direction. Alternatively, it is conceivable to form widthwise grooves in advance in the resin tape itself and to adhere or fuse the end edge portions of the tape so that air passages may be formed through the grooves.

[0057]FIG. 6 shows the flexible hose 6 which is made only of the air-permeable tape 5 by using no resin tape. This flexible hose 6 is formed by winding the air-permeable tape 5 helically and by adhering or fusing the confronting end edge portions of the tapes leading and trailing in the longitudinal direction. In the air-permeable tape 5 at its three widthwise portions, on the other hand, there are buried the reinforcing cores 4, 4 and so on, which are made of a hard synthetic resin or a metal wire and extended in the longitudinal direction of the tape.

[0058]FIG. 7 shows one specific example of using the flexible hose 6. As in the structure shown in FIG. 4, the flexible hose 6 is used as the outer tube of the double-tube structure, in which the inner tube 8 is arranged. As a result, this structure can be used in an application similar to that of the structure shown in FIG. 4.

[0059] The embodiments thus far described have been described as the general flexible hose although not especially limited to the cleaner hose, but can naturally be properly used as the cleaner hose.

[0060] Here will be described embodiments of the flexible hose, which can be most properly used as the cleaner hose.

[0061] In the embodiment shown in FIGS. 8 to 10, the soft resin tape 1 is also made, like before, of a non-vinyl chloride resin such as a polyolefin resin or polystyrene resin, or a vinyl chloride resin. The resin tape 1 is semicircularly bulged at three portions spaced in its widthwise direction, to form three ridges 2 and 2 extending in the tape longitudinal direction on the outer side portion for the hose outer circumference and three grooves 3 and 3 also in the tape longitudinal direction in the inner side portion for the inner circumference.

[0062] In these grooves 3 and 3, like before, there are buried and fixed the linear reinforcing cores 4 and 4 to give the tape 1 proper flexibility and strength. These reinforcing cores 4 and 4 are made of a hard resin such as polypropylene or a metal wire. Here, the reinforcing cores 4 and 4 may be one or two, or four or more but may not be used if the strength is sufficient.

[0063] The air-permeable tape 5 of this embodiment is made of nonwoven or woven fabric, but may be made of another material if this material has an air-permeability and a proper flexibility.

[0064] Moreover, the resin tape 1 and the air-permeable tape 5 are so helically wound together that the end edge portions of the resin tape 1 leading and trailing in the hose longitudinal direction are spaced, and that these spacings are filled up by the air-permeable tape 5.

[0065] In this case, too, like the foregoing embodiments, one end edge of the air-permeable tape 5 is so laid over the inner side of one end edge of the resin tape 1 as to cover the reinforcing cores 4 located at the end edge sides, and the other end edge, as confronting the former end edge, of the air-permeable tape 5 is so laid over the inner side of the other end edge of the resin tape 1 as to cover the reinforcing cores 4 located at the end edge sides. Moreover, the air-permeable tape 5 and the resin tape 1 and the reinforcing cores 4 are integrated with one another either by adhering them with an adhesive layer 7 or by fusing them. The air-permeable tape 5 may be adhered or fused at its end edge portions to the outer sides of the resin tape 1, as has been described hereinbefore.

[0066] The flexible hose 6 to be used as the cleaner hose has such an air-permeability as to suck/discharge air through the air-permeable tape 5 at a flow velocity unlimitedly approximating to 0. In view of the hose entirety, the resin hose 1 having a high strength retains the entire shape keeping property so that it can retain the excellent shape keeping property and strength even where it is used as the repeatedly bent cleaner hose.

[0067] In this case, the ratio, as taken in the hose longitudinal direction, of the air-permeable portion by the air-permeable tape 5 to the air-impermeable portion by the resin tape 1 is 1:20 to 50. Thus, the wholly stronger portion of the resin tape 1 is made so long that the entire hose can have a high strength.

[0068]FIG. 11 shows a vacuum cleaner using the flexible hose 6 thus far described. To a suction nozzle A, there is connected an inflexible control pipe B which is made of a hard resin. The flexible hose 6 is used as an outer tube for the portion connecting the control pipe B and a vacuum cleaner body C.

[0069]FIG. 12 shows a portion of the flexible hose 6 in a longitudinal section. In the inner tube 8 to be disposed in the flexible hose 6 of the invention, there flows in the direction of arrow P, as shown, from the side of the suction nozzle A the air containing sucked dust, so that it is sucked into the vacuum cleaner body C. The inner tube 8 is diametrically enlarged, as different from the embodiment of FIG. 7, to reduce the space between the inner tube 8 and the flexible hose 6 on the outer side.

[0070] In the vacuum cleaner body C, the sucked dust is separated to reside in the body C by the not-shown inside filter so that the air having passed through the filter bypasses the body and flows into the space between the flexible hose 6 of the invention and the inner tube 8 so that it flows in the direction of arrow Q of FIG. 12 in that space until it is circulated to the side of the nozzle A. In the course of the space between the flexible hose 6 of the invention and the inner tube 8, moreover, the air is partially released from the air-permeable tape 5 to the outside.

[0071] Here in FIG. 12, the inner tube 8 is also made of a flexible hose by winding the soft resin tape 9 similar to the resin tape 1 helically and by adhering or fusing the confronting tape end edge portions leading and trailing in the longitudinal direction, to each other. On the other hand, the tape 9 for forming the inner tube 8 is also semicircularly bulged at a plurality of its widthwise portions to form the groove 10 in its inner circumference, and the reinforcing core 11 made of the hard synthetic resin or the metal wire is buried in the groove 10.

[0072]FIG. 13 and subsequent Figures show another embodiment, in which the air-permeable tape 5 is sandwiched between the resin tapes 1 in the flexible hose 6 to be used as the outer tube of the cleaner hose.

[0073] In the embodiments till FIG. 12, the air-permeable tape 5 is made by arranging the nonwoven or woven fabric single member between the resin tapes 1. According to this structure, the tensile strength may become short in the case of the cleaner hose which is repeatedly bent many times. In this embodiment, therefore, the air-permeable tape 5 is made to have a two-layered structure of a nonwoven fabric 16 and a woven fabric 17, as shown in FIG. 14.

[0074] As shown in FIG. 16, the woven fabric 17 is woven crosswise of a number of woven tapes 18, 18 and so on. These woven tapes 18 are prepared by orienting a polypropylene resin to augment the tensile strength and subsequently by slitting the resin to a predetermined width.

[0075] On the other hand, the woven tapes 18 have a width of 0.85 mm and a thickness of 0.03 mm, for example, and are woven at small clearances 19 inbetween to form air-permeable holes 19 at the corners which are defined by the four crosswise adjoining woven tapes 18. Moreover, the woven fabric 17 and the nonwoven fabric 16 are integrally laminated in advance, for example, by overlaying and fusing them to each other.

[0076] The air-permeable tape 5 thus having the two-layered structure of the woven fabric 18 and the nonwoven fabric 16 is made, as shown in FIG. 14, by winding the woven fabric 17 helically on the side of the resin tape 1, i.e., on the outer side in this embodiment such that its end edges are laid over the inner side of the resin tape 1, especially over the reinforcing core 4 exposed to the inner face of the resin tape 1, and by fusing the reinforcing core 4 and the air-permeable tape 5. In this case, the reinforcing core 4 is formed to have a generally elliptical or circular section and to have a flat shape at the portion exposed to the inner circumference of the hose, and is fused at the flat portion 4′.

[0077] When the air-permeable tape 5 and the reinforcing core 4 are to be fused, it is desired to select materials having an excellent mutual fusibility. Where the polypropylene resin is used as the material for the woven fabric 17 or the used face of the air-permeable tape 5, for example, it is desirable that the same polypropylene resin is used for the material of the reinforcing core 4. It is, however, not excluded that the woven fabric 16 and the resin tape 1 are connected by means of the adhesive.

[0078] The hose 6 of this embodiment is highly strong because the air-permeable tape 5 is given the two-layered structure. The air-permeable tape 5 is hardly broken even if it is tensed at the time of bending the hose 6, especially because the woven fabric 17 of the highly strong resin and the resin tape 1 are integrally connected. On the other hand, the air-permeable tape 5 is fused to the reinforcing core 4 having a high heat capacity so that a high fusion strength can be obtained.

[0079] Since the inner nonwoven fabric 16 has very fine pores of the air-permeable portions, as compared with the woven fabric 17, on the other hand, it can be expected to play not only the role of a filter for preventing the dust to pass through the hose from being entrained to the outside by the discharge having the heat but also the role of a sound absorbing material.

[0080] In FIG. 13, the inner tube 8 is inserted in the flexible hose 6. This inner tube 8 is also constructed by winding the resin tape 9 helically like before. On the outer circumference of the resin tape 9, there are helically wound two reinforcing cores 21 and 21 which are made of a hard resin. In these reinforcing cores 21, there are sheathed one or two conductors 22 and 22 for transmitting the electric power and the electric signals to the suction nozzle A.

[0081] In the hoses of the double-tube structure of FIGS. 4, 7, 8, 12 and 13, when the hose 6 acting as the outer tube and the inner tube 8 are bent, of the inner circumference of the outer hose 6 and the outer circumference of the inner tube 8, especially the inner circumference of the outer hose 6 is rubbed in this embodiment by the surfaces of the projections such as the reinforcing cores 21 on the outer side of the inner tube 8 so that it is possibly worn after a long use to expose the conductors 22 to the outside, or so that the outer hose 6 is possibly worn and holed.

[0082] Therefore, a lubricant is applied to or mixed into the surface of the projections such as the reinforcing core 21 and/or the inner circumference of the outer hose 6 to rub each other, thereby to give lubricating properties. More specifically, it is conceivable to mix the lubricant in advance at the time of preparing the resin tape 1 for forming the outer hose 5 and to wind the resin tape 1 helically together with the air-permeable tape 5.

[0083] This application or mixing of the lubricant need not always be performed all over the hose but can be omitted from the portion which has no or little rubbing possibility. In the case of the application to the inner tube 8, it is desirable to apply the lubricant to the projections such as the reinforcing core 21. In the absence of the projections or the reinforcing core 21, however, the application is made to the portion constructing the inner tube body.

[0084] The lubricant to be used should not be especially limited if it acts as an external lubricant for lubricating the surfaces, but can be exemplified by a variety of lubricants such as silicones, fluorine-containing resins, fatty acids, paraffins or waxes. Suitable weight parts of lubricants are mixed according to the characteristics of their kinds.

[0085] Here, any of the outer hoses 6 of the foregoing embodiments has the air-permeable tape 5 sandwiched between itself and the resin tape 1. Where the air permeability is not needed, that is, where the air to be circulated to the suction nozzle A of FIG. 11 need not be partially released from the outer hose 6, that air-permeable tape 5 is not used. It is quite natural that such activity can be applied to such case.

[0086] Although the invention has been described in connection with its preferred embodiments, it should not be limited thereto but can be modified in various manners, as inclusive, within the scope of the appended claims. 

What is claimed is:
 1. A flexible hose formed by winding a soft resin tape helically, comprising: an air-permeable tape is sandwiched between the tape end edge portions, as leading and trailing in the hose longitudinal direction, of said resin tape and is helically wound integrally with said resin tape.
 2. A flexible hose according to claim 1 , wherein the two end edges of said air-permeable tape are laid over the end edges of said resin tape and are adhered or fused to each other.
 3. A flexible hose according to claim 1 , wherein said resin tape includes an outer tape forming the hose outer circumference and an inner tape forming the hose inner circumference, and wherein said air-permeable tape is sandwiched at its end edge portions between the end edge portions of said outer tape and said inner tape and is adhered or fused to each other.
 4. A flexible hose according to any of claims 1 to 3 , wherein said air-permeable tape is made of a nonwoven fabric or a woven fabric.
 5. A flexible hose according to any of claims 1 to 4 , further comprising: at least one reinforcing core is arranged at one or a plurality of widthwise portions of said resin tape and in the tape longitudinal direction.
 6. A flexible hose according to any of claims 1 to 5 , further comprising: a hose made of a flexible hose and arranged as an inner tube in said flexible hose to form a gas communication passage between said inner tube and the outer flexible hose.
 7. A flexible hose formed by winding an air-permeable tape helically, comprising: at least one reinforcing core arranged at one or a plurality of widthwise portions o said air-permeable tape and in the tape longitudinal direction.
 8. A flexible hose according to claim 7 , further comprising: a hose made of a flexible hose and arranged as an inner tube in said flexible hose to form a gas communication passage between said inner tube and the outer flexible hose.
 9. A flexible hose according to any of claims 1 to 8 , wherein said flexible hose is used as a cleaner hose.
 10. A flexible hose for use as a cleaner hose formed by winding a soft resin tape helically, comprising: an air-permeable tape having a two-layered structure including a nonwoven fabric and a woven fabric is sandwiched between the tape end edge portions, as leading and trailing in the hose longitudinal direction, of said resin tape and is helically wound integrally with said resin tape.
 11. A flexible hose for use as a cleaner hose according to claim 10 , wherein said woven fabric is made of a polypropylene resin or another resin and is fused at its end edge portions to the end edge portions of said resin tape.
 12. A flexible hose for use as a cleaner hose according to claim 10 or 11 , wherein said woven fabric is wound with said nonwoven fabric to form said air-permeable tape, in such a manner as that said woven fabric is on the outer side of said nonwoven fabric.
 13. A flexible hose for use as a cleaner hose according to any of claims 9 to 12 , further comprising: at least one reinforcing core is arranged at one or a plurality of widthwise portions of said resin tape and in the tape longitudinal direction, wherein said reinforcing core and said air-permeable tape are fused or adhered to each other.
 14. A flexible hose for use as a cleaner hose according to any of claims 9 to 13 , wherein the ratio, as taken in the hose longitudinal direction, of the air-permeable portion by said air-permeable tape to the air-impermeable portion by said resin tape is 1:20 to
 50. 15. A flexible hose for use as a cleaner hose formed by winding an air-permeable tape helically, comprising: at least one reinforcing core arranged at one or a plurality of widthwise portions o said air-permeable tape and in the tape longitudinal direction.
 16. A flexible hose having a double-tube structure including an inner tube and an outer tube for use as a cleaner hose according to any of claims 1 to 15 , comprising: an outer tube made of a hose according to any of claims 1 to 15 ; and a hose made of a flexible hose and arranged as an inner tube in said outer tube for providing a passage in said inner tube as a flow passage from a suction nozzle to the body of a vacuum cleaner and a passage between said outer tube and said inner tube as a circulation passage for the air to circulate from said vacuum cleaner body to said nozzle.
 17. A flexible hose for use as a cleaner hose, comprising an inner tube and an outer tube, wherein at least one of the outer circumference of said inner tube and the inner circumference of said outer tube is given at its whole or partial face lubricating properties by a lubricant applied to or mixed into the surface.
 18. A flexible hose for use as a cleaner hose according to claim 17 , wherein the portion given the lubricating properties is said outer tube.
 19. A flexible hose for use as a cleaner hose according to claim 18 , wherein said outer tube is formed by winding a soft resin tape helically, and wherein said lubricant is mixed into said resin tape.
 20. A flexible hose for use as a cleaner hose according to any of claims 17 to 19 , wherein said outer tube is formed by winding a resin tape helically, comprising an air-permeable tape is sandwiched between the leading end edge portion of said resin tape and the trailing end edge portion of said resin tape and is wound integrally with said resin tape. 